Why does the relation created as result of a Projection operation on a relation that includes the primary key not contain fewer tuples than those in the source relation?

QUESTION:

Why does the relation create a result of a Projection operation on a relation that includes the primary key not contain fewer tuples than those in the source relation?

SOLUTION

There are no duplicate tuples to eliminate since the value of the attribute(s) that constitute the primary key is unique in the source relation.

 

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